Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:19:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[x].size(); i++) ^ user.cpp:27:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:50:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < sol[i].size(); j++) ^